In 1956, the ship -- cargo carrier named 'Pine Tree Mariner' -- was sold to Matson Navigation Co., "converted into a passenger ship at Willamette Iron and Steel Corp., Portland, Oregon, and renamed Mariposa." Her maiden voyage for Matson was from San Francisco, California, to Sydney, Australia, by way of Honolulu, Hawaii, and Auckland, New Zealand, on 27 October 1956.
Story from Portland
Oregonian daily newspaper.
